Can you ask them where did they get the Bitcoin price from? They should have already mentioned withdrawal fees if there were any, so it looks more like a difference in the exchange rate of Bitcoin.
no, he wasn't charged a withdrawal fee
and the rate used is about right according to blockchain.com historical rate
if I mouse over on the amount button, I get this
90.94 USD @2019-06-26T23:32:16Z I will add something that I deemed to much info, initially. The original amount--I DID take a quick look within a day after the transfer, was about $83. By the time I made the purchase it had dropped to the amount you all can see, which is about a $15 drop, as I did absolutely nothing.
you clearly never hold foreign currency before, as you failed to understand exchange rate risk
what you saw was your bitcoin amount in $ value based on BTC/USD rate at that time
so it's normal to see the value in $ change so drastically caused by bitcoin's volatility
you should pay attention more to your bitcoin amount not its $ value when making
BTC transaction
check Abdussamad and o_e_l_e_o posts for more detailed explanations on $ value calculations
that should give you deeper understanding on your past bitcoin transactions